The tight lash solid rollers I've run were set at .010 cold, I wouldn't run more than .016 cold on a standard cam, but that's just me. From what I've seen the tight lash is a faster ramp that will wear things out faster. You can make good power with a slower ramp solid roller cam and it will live longer. I would check the lifters at 100 hours, pull them out and spin the rollers, the Crower 66291H are rebuild-able. In my opinion the stainless shaft rockers are more stable than your stud girdle, you're not putting all of the pressure at the top of the rocker stud. The stands bolt directly to the head. All rockers have a life cycle, I believe stainless is about 10 x longer than aluminum maybe more. Break a rocker at any RPM and you beat the piss out of the cam lobe, lifter and push rod, one of them will be the next thing to go. My opinion, the valve train is not the place to budget, do it right the first time and you'll save a ton of money in the long run.

HP is limited by the air and fuel that can't get through the motor, the better flowing heads (without being excessively large) with the right cam, intake and exhaust will make the best power. Maybe have someone flow your 325's and see how they compare to the 335. Are you staying with the 509 ?

This should keep you busy, Bullet Cams Master List

Me to, he was a great guy, some of his stuff was pretty harsh for the marine world.

Not saying that's it's simple or that I know that much about it, but if you compare initial, .050 and .200 numbers you can see why some cams will make more power than others, idle differently with the same .050 numbers, and beat the hell out of the rest of the valve train.

I ran them both ways only because I trashed a lifter bore when a lifter came apart. I always wondered how much it weakened the block boring it out for the bushing. I have to think the bronze would wear faster than the cast iron, can it hold the lifter as stable being a softer material. I was running 350 at the seat and 1000 open at one time without bushings, I would rather run the .903 lifter if I had the choice. I'm not an engine builder so this is just my opinion.

The key is the Right guy, not some dweeb reading a computer screen that never saw the inside of an engine.

I never tried them, can't figure out how they don't overheat and gall up.

Isky EZ-Roll Lifter;
The design differences between a bushing — Isky refers to it as a “solid bearing” but we’ll use bushing as it’s a reference more familiar to engine builders today — and needle bearing are simple, but the pros and cons of each aren’t always so obvious. The needle bearing wraps the axle with numerous tiny cylindrical rollers that are well-suited for reducing friction because the line point of contact is so thin along the length of the needle. However, needles can suffer surface wear and flat spots if the loads are too heavy for such a small contact area. With the bushing design, the axle shaft does not touch the bushing shell. Instead, there is a film of oil or hydraulic wedge that carries the load of the lifter. With proper oil pressure and the correct lubricant, the bushing can not only last longer, but by spreading the load over a greater area of the axle, the lifter can support higher spring pressures.

The 741 has a little more overlap than a norm blower cam,ital work and make the power,mine has a little tracking from low port velocity, but prob the reason i can run more boost on 93, the cam company's should have a good marine blower cam. also would call Kip at Cam Motion, he was making some big power on the old (HotRod mag)Pump gas drags, I would think that would carry over to marine blown on 93 etc. I wouldn't run a solid roller, just harder to adjust the lash with headers,Ive ben running solids on street cras/race cars awhile, really dont see much change in valve adjustment,but i do spend the extra running the Crower stuff,helps a buddy thats WD with Crower to.
You should beable make 800's easy with the heads your talking about,My Scarab motor /494.8/71,2 1050's,innercooler made 828 at 7200 w/ hyd roller, Crower lifters,All Crower guts.
My Hustler is 500efi,741 cam,I ported the stock steel heads myself,whipple 3/3 etc, it made 840s at 6-6100, 8.5 boost, Last rebuild went with new Dart block,no other change except dyno w/ 93 ethanol fuel made 883 at 6000.thats crane 741,crane gen 6 style 500efi hyd lifters,gold rockers, 1 step above 929 spring,

If ya get to radical on cam etc the idle gets worse, docking,

I didnt read the hole thread, not sure your carb or fuel inj, just my 2 cents.

good luck with your combo,
Rob

im curious to see what you make
i just did a 502(575sci rebuild), 7.5:1 compression, AFR 315 heads, 741(525) cam, 8-71 and small ass TBI. made 775hp at 4psi. so im sure you can reach your 850 with ease